Juncus tenuis

Tracheophyta MagnoliopsidaJuncaceaeJuncusJuncus tenuis


A slender, tufted perennial herb found in damp open ground by roads and lakes, on paths and in woodland and forest rides. 0-430 m (above Dent station, N.W. Yorks., and in the Caulderbeck Fells, Cumberland).



World Distribution

Native of N. & S. America.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 7

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 4

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.6

July Mean Temperature (Celsius): 14.6

Annual Precipitation (mm): 1267

Height (cm): 40

Perennation - primary


Life Form - primary




Clonality - primary

Tussock-forming graminoid, may slowly spread

Count of 10km squares in Great Britain: 1053

Count of 10km squares in Ireland: 145

Count of 10km squares in the Channel Isles: 3

Atlas Change Index: 0.83

Weighted Changed Factor: 18

Weighted Change Factor Confidence (90%)


JNCC Designations


Atlas text references

Atlas (317d)
FNAEC (2000)
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Meusel H, Jäger E, Weinert E
1965.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
Richards (1943a)
Salisbury EJ
1974.  The reproduction of Juncus tenuis and its dispersal. Transactions of the Botanical Society of Edinburgh. 42:187-190.